Type-casting machine



(No Hodl. 2 Shets-Shet 1. J. G. PAVY-HR. 7 TYPE CASTING MACHINE- No.495.704. Pate'ntdApr. 18. 1893.

ma "cams PETERS co, mum LITHO., WASHINGTON u. c.

UNITED STATES PATENT ()FFICE.

JAMES G. PAVYER, OF ST. LOUIS, MISSOURI.

TYPE-CAST] NG MACH IN E.

SPECIFICATION forming part of Letters Patent NO. 495,704, dated April18, 1893.

Application filed February 29, 1892. Serial No. 423.279. (N model.)

To 60% whom it may concern:

Be it known that I, JAMES G. PAVYER, 0f the city of St. Louis, in theState of Missouri, have invented a certain new and useful Improvement inType-Casting Machines, of which the following is a full, clear, andexact descript1on,reference being had to the accompanying drawings,forming part of this specification. The principal part of this inventionconsists in connecting the chamber of the choker valve with a closedtype-metal chamber, that is thrown into communication with a closedvessel or chamber supplying air or other fluid under sufficient pressureto cause the ejection of the metal from the nipple into the mold withthe required force.

The invention also consists in the means hereinafter described andclaimed for carrying out the process.

Figure I is a top view illustrating the invention. Figs. II and IIIareelevations of opposite sides. Figs. IV and VI are enlarged, verticalsections taken at IVVI, Fig. I, showing moving parts in differentpositions. Figs. V and VII are vertical sections, taken at V- VII,showing the compound choker valve in difierent positions. Fig. VIII is ahorizontal section, taken at VIII-VIII, Fig. IX. Fig. IX is an enlarged,vertical section, taken at IX-IX, Fig. I.

' 1 is the melting pot for the type metal having fiues 2 and a chimney 3for the products of combustion.

i is the chamber of the choker valve 5 that closes the jet orifice ofthe nipple 6. The

stem 7 of the choker-valve passes through the duct or passage 8 leadingfrom the melting pot to the chamber l. The passage 8 has a valve seat 9at the end communicating with the chamber 4 against which closes a valve10 upon the stem 7. It will be seen that when the valve 5 is closed thevalve 10 is open and vice versa, see Figs. V and VII. The end of thevalve stem 7 within the melting pot passes freely througha post 11 andis guided thereby.

12 is a downwardly extending arm on a le ver 13, fulcrumed at 14 to thepot l. The arm 12 passes through an orifice in the valve stem 7, so thatas the lever is moved on its fulcrum, the valves 5 and 10 are opened andclosed alternately.

15 is a bell-crank which is fulcrumed to the frame 16 at 17. The uprightarm 15 of the bell-crank is adj ustably connected to the horizontal arm15 by a bolt or bolts 18 passing through a slotted lug 15 The free endof the arm 15 carries an anti-friction wheel 19 against which works acam 20 on a camshaft 21.

22 is a spring beneath the arm 15 which forces the arm upward into itsnormal position, seen in Fig. III, the choker-valve being then closed asseen in Fig. V. As the arm. 15 is forced down by the cam 20 thechoker-valve 5 is opened and the valve 10 closed.

23 is a duct'leading from the valve or nipple chamber 4 to the closedchamber 24 containing type-metal.

25 is a pipe leading from the top of the chamber 24: to a valve chamber26. The chamber 26 communicates by a valve port 27, at top, with achamber 28 that communicates by a pipe or passage 29 with areservoir,29', containing air or other fluid under pressure.

The port 27 is closed by a valve 30 that is normally forced down uponits seat by a spring 31 surrounding its guide stem 32 and with endsbearing respectively upon the valve and top 33 of the chamber 26. Whenthe valve 30 is open, the chamber 24 is in communication with thepressure chamber and the type metal is forced from the chamber 24 intothe nipple chamber and the valve 10 being closed and valve 5 open, themetal is ejected from the nipple into the type mold.

The annular valve chamber 26 is closed at bottom by a piston 35 thatworks in the cylinder 34 forming the lower part of the casing. The upperportion of the piston is tubular and the axial bore or duct 36 extendsfrom the top to a radial passage or duct 37, that registers with port 38extending through the side of the cylinder 34; for the exit of air orother fluid, from the chamber 26 at the proper time, or when the piston35 is in its lower position.

39 is a tubular piece that forms the upward continuation or extension ofthe piston 35 but of a smaller diameter and forming the inner wall ofthe annular chamber 26. The duct 36 also extends through the piece 39.At the upper end of the piece 39 is a valve seat 39 upon which the valve30 is seated at certain times to close the duct 36 and thus prevent theescape of air or other working fluid through the duct 36, 3'7, 38. Thisposition is shown in Fig. VI, the piston 35 having been raised until theseat 39 of the tubular piece 39 is brought against the bottom of valve30 for closing the exhaust duct 36 and raising the said valve 30 fromits seat and opening the duct 27 and admitting the compressed fluid fromthe chamber 28 to the chamber 26. As the exhaust duct 36 is closed thecompressed air can only escape from the chamber 26 through the duct andinto the chamber 24 as before set forth.

In order to lift the piston 35. its lower end is provided with a lug 40connected by a rod or link 41 to one end of a lever 42 fulcrumed at 43to the fixed frame 16. The front end of the lever carries ananti-friction roller 44 acted upon by a cam 45 on the shaft 21.

46 is a spring adapted to lift the front end of the lever' 42 and drawdown the piston 35 for seating the valve and closing the port 27 andthus closing communication between the chambers 28 and 26. The continueddescent of the piston to its lowest position draws the tubular piece 39from under the valve 30 and allows the fluid to escape from the chamber26 through the exhaust duct 37, 38.

The operation may be briefly described as follows: The parts are shownin normal position in Figs. IV, V and IX, the valves 5 and 30 closingrespectively the jet hole of the nipple 6 and the communication betweenthe chambers 28and26. Atthistimethemetalisflowingfrom the kettle intothe chamber 24. The cam now depresses the forward end of the lever 42which pushes up the piston 35, seats the piece 39 against the valve 30and lifts the valve from its main seat; at the same time the valve 10 isclosed and the valve 5 opened. There is now continued communication fromthe compressed fluid vessel 29, chambers 28 and 26, duct 25, chamber 24and duct 23 to the nipple chamber, and the metal is forced from thelatter by the pressure of the compressed fluid.

I claim as of my invention 1. The combination, in a type castingmachine, of the melting kettle, 1, compressed fluid reservoir 29 chamber28 in constant communication with the reservoir, chamber 26 having anexhaust valve and communicating with chamber 28 through duct 27, valve30 adapted to close the duct 27,a chamber 24 in constant communicationwith the chamber 26, and a nipple chamberin constant communication withchamber 24 and havingcommunication with the kettle by a duct governed bya valve 10, all substantially as set forth.

2. The combination, in a type casting machine, of a melting kettle, areservoir for fluid under pressure, chambers 28 and 24 communieatingrespectively with the fluid reservoir and nipple chamber, a nipplechamber commumeating with the melting kettle and the outer air, and thechamber 26 communicating with the chambers 24 and 28, and the outer air;valves for closing'and opening communication between the chambers 28 and26, chamber 26 and the outer air, the melting kettle and nipple chamber,and the nipple chamber and the outer air; and means for alternatelyeffecting the simultaneous closing and simultaneous opening of saidvalves, the valves between the chambers 28 and 26 and the nipple chamberand outer air, being closed when the remaining valves are open, and viceversa; substantially as and for the purpose herein set forth.

3. The described combination, in a typecasting machine, of a meltingkettle, a nipple 4 having a jet valve 5 and a valve 10, the latteradapted to close communication with the melting kettle, a closed vesselin communication with the nipple chamber and with a chamber 26, achamber 26 having an exhaust valve, a piston 35 working in the chamberand actuating the exhaust valve, a reservoir for fluid under pressure, achamber 28 in communication with the reservoir, a duct leading from thechamber 28 to chamber 26, and a valve 30 governing said duct andgoverned by the piston 35, substantially as set forth.

4. In a type casting machine, the combination of a melting kettle, achamber communicating with a reservoir of compressed fluid, a closedmetal chamber within the melting kettle and communicating therewith andthe compressed fluid chamber, adischarge nozzle communicating with theclosed metal chamber, valves controlling the communications between theclosed metal chamber and compressed fluid chamber, and the closed metalchamber and the melting kettle, and means for opening and closing saidvalves alternately, substantially as set forth.

5. In a type casting machine, the combination of a melting kettle, achamber communieating with a reservoir of compressedfluid, a closedmetal chamber within the melting kettie and communicating therewith andwith the compressed fluid chamber, a discharge nozzle communicating withthe closed metal chamber, valves controlling the communications betweenthe closed metal chamber and compressed fluid chamber and the closedmetal chamber and the melting kettle, levers connected to said valves,and cams mounted on a suitable cam shaft and engaging said levers,whereby the valves will be alternately opened and closed, for thepurpose herein'set forth.

JAMES G. PAVYER. Witnesses:

SAML. KNIGHT, A. M. EBERSOLE.

